How do I remove objects from scene

This topic has 18 replies, 5 voices, and was last updated 4 years, 2 months ago by Yuri Kovelenov.

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2019-09-08 at 12:06 pm #18501

madbat
Customer

Hey!

I can append scene and clone objects, But how do I remove objects that I have cloned?
Like what you do with verge3d :)

// Patrik

2019-09-09 at 7:03 am #18508
Yuri Kovelenov
Staff
Hi,

You can do it with JavaScript as per method #2 of our JavaScript guide:
```
    app.ExternalInterface.removeObject = function(objName) {
        var obj = app.scene.getObjectByName(objName);
        app.scene.remove(obj);
    }
```
Here is a Puzzle snippet for calling this function:

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2019-09-09 at 7:47 am #18514

zjbcool
Customer

Oh,I think we can create a partical system using puzzle now.

https://zjbcool.com/ | Gumroad | Twitter | YouTube | Bilibili

2019-09-09 at 8:06 am #18520

Yuri Kovelenov
Staff

zjbcool wrote:

partical system using puzzle now

Would be interesting to see if this can work

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2019-09-09 at 2:43 pm #18531
jem
Customer
Hi Yuri,
I do not wish to complicate this topic, but I do wonder if the remove() function is sufficient to completely remove an object and its data from memory? There are a few threads about this on Stack Exchange and a page in the Three documentation (https://threejs.org/docs/#manual/en/introduction/How-to-dispose-of-objects). I wrote a function to do this that removes the object from the scene and also disposes of the data. My hope was this approach would free up memory better than using remove() alone. What is the opinion of the Soft8soft team?
Thank you.
```
	//A function to fully dispose of objects.
	//This is useful to dispose of cloned objects.
	app.ExternalInterface.disposeOfObjects = function (objects) {
		for (var i = 0; i < objects.length; i++) {
			if (typeof objects !== 'undefined') {
				var meshToBeDeleted = app.scene.getObjectByName(objects);
				app.scene.remove(meshToBeDeleted);
				meshToBeDeleted.geometry.dispose();
				meshToBeDeleted.material.dispose();
				meshToBeDeleted = undefined;
			}
		}
	};
```
Jeremy Wernick
2019-09-09 at 2:57 pm #18533

Yuri Kovelenov
Staff

jem wrote:

if the remove() function is sufficient to completely remove an object and its data from memory?

Indeed, calling dispose() for both geometry and the material is necessary to free memory occupied by an object’s resources. Thank for sharing the snippet!

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2019-09-09 at 3:19 pm #18535

jem
Customer

Oops. I was editing my previous post in an attempt to fix the formatting of the JavaScript code and the forum software seems to have deleted the post. Apparently square brackets can cause issues. At risk of double posting, here is my original post that Yuri responded to (with the JS code now included as an image).
———————-
Hi Yuri,
I do not wish to complicate this topic, but I do wonder if the remove() function is sufficient to completely remove an object and its data from memory? There are a few threads about this on Stack Exchange and a page in the Three documentation (https://threejs.org/docs/#manual/en/introduction/How-to-dispose-of-objects). I wrote a function to do this that removes the object from the scene and also disposes of the data. My hope was this approach would free up memory better than using remove() alone. What is the opinion of the Soft8soft team?
Thank you.

Jeremy Wernick

2019-09-09 at 3:32 pm #18538

Yuri Kovelenov
Staff

It happens sometimes with the syntax highlighting add-on we’re using. We should probably find a better one.

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2019-09-10 at 4:39 pm #18545

madbat
Customer

Thanks for quick reply.

2020-09-28 at 8:56 am #33480

matthew
Customer

Hello,

I am not proficient in JS and cannot figure out how to remove every clone created besides the last one created (every next one still exists after I click the remove button). Here are my puzzles:

2020-09-28 at 9:17 am #33483

Yuri Kovelenov
Staff

hi,

looks like the image was not attached.

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2020-09-28 at 9:19 am #33484

matthew
Customer

Oh sorry, I hope here it is:

2020-09-28 at 9:21 am #33487

matthew
Customer

For some reason I cannot attach an image. Maybe this will work:

2020-09-28 at 9:31 am #33488

Yuri Kovelenov
Staff

Got it! In fact, there is no longer need to use code, since an object can now be removed with this puzzle:

https://www.soft8soft.com/docs/manual/en/puzzles/Objects.html#remove

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2020-09-28 at 9:52 am #33489

matthew
Customer

That’s great Yuri, however problem still remains. I need to remove every cloned object at each click of the button. For example – if I create 4 clones I want to be able to delete them all with each click deleting last one object added. Right now I can only delete exactly the last object cloned and rest of them remain on the scene. Puzzles below:

How do I target every object in the list of cloned objects – and delete them one by one? I assume the problem is with the cloning puzzle itself. There should be a loop adding an object inside the array/list for each click but I can’t seem to figure it out – pls help ^_^
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